What does cPanel's Track Delivery feature do?

The Track Delivery feature in cPanel Control Panel is a web interface which allows cPanel users to view reports about failed e-mail delivery attempts. The feature gives users the opportunity to track the course of message delivery as well as to trace the path of a message's delivery. The feature is very useful when it comes to tracking message delivery issues. 

The system, by default, shows a list of the latest 250 delivery failures both to and from all of the account's mailboxes.